diff --git a/examples/determinator-rails/Gemfile.lock b/examples/determinator-rails/Gemfile.lock
index 1878a67..917d10a 100644
--- a/examples/determinator-rails/Gemfile.lock
+++ b/examples/determinator-rails/Gemfile.lock
@@ -83,9 +83,11 @@ GEM
     nio4r (2.5.4)
     nokogiri (1.11.1-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.11.1-x86_64-linux)
+      racc (~> 1.4)
     puma (3.12.6)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.4.4)
@@ -132,6 +134,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   byebug